Metadata Gen (metadata-gen)

A powerful Rust library for extracting, validating, and processing metadata in YAML, TOML, and JSON formats from any content or data file.

Overview

metadata-gen is a robust Rust library designed for extracting, validating, and processing metadata from various content and data file formats. It focuses on the following key areas:

• Parsing and serialization of metadata in YAML, TOML, and JSON formats
• Extraction of frontmatter metadata from content files
• Generation and management of meta tags for web content
• Efficient processing of both local files and string content
• Flexible integration with static site generators and content management systems

Key features include:

• A unified API for handling metadata across different formats
• Robust error handling and reporting
• Customizable parsing options to accommodate various metadata structures
• Asynchronous file processing capabilities
• Utility functions for HTML entity escaping and unescaping
• Type-safe metadata value handling through a custom Value enum
• Generation of SEO-friendly meta tags from extracted metadata

metadata-gen aims to provide a stable and powerful foundation for metadata management across all platforms supported by Rust.

Installation

Add this to your Cargo.toml:

[dependencies]
metadata-gen = "0.0.1"

Usage

Here are some examples of how to use the library:

Extracting Metadata

use metadata_gen::extract_and_prepare_metadata;

let content = r#"---
title: My Post
description: A sample post
keywords: rust, metadata, extraction
---
Content here"#;

let result = extract_and_prepare_metadata(content);
if let Ok((metadata, keywords, meta_tags)) = result {
    println!("Metadata: {:?}", metadata);
    println!("Keywords: {:?}", keywords);
    println!("Meta tags: {}", meta_tags);
}

HTML Escape/Unescape Example

use metadata_gen::utils::{escape_html, unescape_html};

let original = "Hello <World> & \"Friends\"";
let escaped = escape_html(original);
let unescaped = unescape_html(&escaped);

println!("Original: {}", original);
println!("Escaped: {}", escaped);
println!("Unescaped: {}", unescaped);

Asynchronous File Processing

use metadata_gen::utils::async_extract_metadata_from_file;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let (metadata, keywords, meta_tags) = async_extract_metadata_from_file("./examples/example.md").await?;
    println!("Metadata: {:?}", metadata);
    println!("Keywords: {:?}", keywords);
    println!("Meta tags: {}", meta_tags);
    Ok(())
}

Documentation

For full API documentation, please visit docs.rs/metadata-gen.

Examples

To run the examples, clone the repository and use the following command:

cargo run --example example_name

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Acknowledgements

Special thanks to all contributors who have helped build the metadata-gen library.